package aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Aspect // 表示这是一个切面类
@Component // 结合扫描包，产生 bean 对象注入到 IoC 容器中
public class TransactionAspect {
    private static final Logger log = LoggerFactory.getLogger(
            TransactionAspect.class);

    @Pointcut("execution(* Service..*(..))")
    public void pt() {
    }

    @Before(value = "execution(* Service..*(..))")
    public void before(JoinPoint jp) {
        log.info("【TransactionAspect 前置增强】模拟打开数据库连接并开启事务...");
        log.info("SqlSession sqlSession = MyBatisUtil.createSqlSession(false);");
    }

    @AfterReturning(value = "execution(* Service..*(..))", returning = "result")
    public void afterReturning(JoinPoint jp, Object result) {
        log.info("【TransactionAspect 后置增强】模拟正常完成业务提交事务...");
        log.info("session.commit();");
    }

    @AfterThrowing(value = "execution(* Service..*(..))", throwing = "e")
    public void afterThrowing(JoinPoint jp, Throwable e) {
        log.info("【TransactionAspect 异常抛出增强】模拟业务异常回滚事务，异常信息为：" +
                e.getMessage());
        log.info("session.rollback();");
    }

    @After(value = "execution(* Service..*(..))")
    public void after(JoinPoint jp) {
        log.info("【TransactionAspect 最终增强】模拟业务完成释放资源...");
        log.info("MyBatisUtil.closeSqlSession(sqlSession);");
    }
}